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Finding the Fourth Proportional to 93.40, 128.75 and 68.79

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Solution

The fourth proportional to 93.40, 128.75 and 68.79 is: 94.83

Step by Step Solution

  1. Step 1: Write the proportion equation
    93.40 : 128.75 = 68.79 : x
  2. Step 2: Convert to fraction form
    93.40/128.75 = 68.79/x
  3. Step 3: Cross multiply
    93.40x = 128.75 × 68.79
  4. Step 4: Simplify right side
    93.40x = 8,857.11
  5. Step 5: Solve for x
    x = 8,857.11/93.40
  6. Step 6: Final answer
    x = 94.83

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Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.